Drill-steel retainer



April 28, 1931. w p w z 1,802,983

DRILL STEEL RETAINER Filed Oct. 31. 1927 IN V EN 7 R. M111 mplvellurllg known in the art.

Patented Apr. 28, 1931 attic WILLIAM PRELLWITZ, OF EASTON', PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND GDMPANY, OF JERSEY CITY, NEW JERSE A CORPORATION OF NFL-VT JERSEY DRILL-STEEL RETAINER Application filed October 31, 1927.

This invention relates to rock drills and more particularly to a retainer for maintaining the tool in position in the drill.

One object of the invention is to hold the drill steel retainer in its steel engaging position to permit removal of the steel and to provide positive acting means to automatically return the steel retainer to its steel enga ing position. F

at lier ob ects and advantages or the 111- vcntion will be in part obvious and in part pointed out hereinafter.

In the drawing forming part of the specitication and in which similar reference characters refer to similar parts,

Figure 1 is a side elevation of the front head of a rock drill provided with a steel retainer constructed in accordance with the practice of the invention, part of the steel retainer being shown in section to show the interior construction,

Figure 2 is a front elevation of the rock drill front head and steel retainer, and

Figure 3 is an end view of the collar oni gaging portion of the steel retainer.

Referring to the drawing, only the front head of the rock drill is shown, it being understood that the remainder of the tool may be constructed in any of the forms well The front head of the rock drill is indicated at A and is adapted to receive the shank B of the drill steel C, there being a collar D provided on the drill steel to prevent the steel from extendng into the front head beyond.

a predetermined distance. In this instance the front head A is provided with a flange E through which bolts F are adapted to pass to attach the front head to the remainder of the rock drill (not shown). The front head A of the rock drill is provided with a pair of members G extending outwardly and adapted to support a yoke H which is arranged to spring into position to encircle the drill steel C and as shown in Figure 3, it is provided with a steel encircling portion J having an aperture K slightly larger than the drill steel C but smaller than the collar D. The yoke H is adapted to spring back out of Serial No. 230,015.

the way of the collar D as shown in dot and dash lines in Figure 1.

Means are provided by this invention to bias the yoke so that it normally tends to stay in the collar engaging position. To this end the yoke H is provided with a pair of rods L preferably formed integrally with the yoke H and extending upwardly through apertures O in the members G which apertures are sufficiently large to permit the yoke H and rods L to be drawn aside when it is desired to disengage the steel C. The yoke H is biased by the provision of a pair of bearing members on each rod L comprising an upper bearing P and a lower bearing Q. The bearing members P and Q are provided with cylindrical bearing surfaces R and S eccentric to each other and adapted to cooperate with corresponding cylindrical eccentric bearing surfaces T and U on the members G. The bearing members P and Q are slidable longitudinally on the rods L as the yoke H is moved in a swinging direction.

It will be noted that as the rods L rotate the bearing members P and Q, are moved apart with respect to each other due to the eccentricity of their bearing surfaces R and S. In this instance the rod L extends in the direction of a diameter of the bearing surface S of the lower bearing member Q and parallel to a diameter of the bearing surface R of the upper bearing member P. The eccentricity of the bearing surfaces is such that when the yoke H is in its collar engaging position, the centers of the bearing members P and Q, are at their least possible distance. To maintain the yoke H in this position resilient means are provided comprising a spring V encircling each rod L and held thereon by means of a nut stationary at the end of the rod L, the spring 'V being normally under tension and adapted to bear against the upper bearingmember P.

In operation the yoke H normally tends to stay in position in line with the dri l steel, since the pressure of the spring V normally presses the upper and lower bearing members P and Q respectively together. To remove the steel C the yoke H is pressed manually to the position shown in the dot and dash lines wherein the spring V is compressed by the further separation of the upper and lower bearing members P andQ. then released the yoke H tends to return to its steel engaging position, due to the compression of the spring V tending to return the bearing members P and Q to their normal position.

Thus by the above construction are accomplished, among others, the objects hereinbefore referred to. l

I claim:

1. A retainer for collared steels of a rock drill and the like, comprising a yoke normally adapted to obstruct the passage of the collar, members extending from the rock drill and having arcuate bearing surfaces eccentric one with the other, rods extending through and cooperating wi h said members to permit swinging movement of the yoke out of the path of the collar, bearing members supported by said rods and movable upon with said arcuate bearing surfaces, and a spring pressing said bearing members against said ing surfaces and urging said yoke into collar engaging position.

2. A retai for collared steels of a rock drill and the o comprising a yokenormally adapted to obstruct the passage of the collar, members extending outwardly from the rock drill and haying cylindrical bearing suriaces, rods forming part of the yoke and cooperating with said members to permit swinging movement of the yoke out of the path of the collar, a pair of bearing members eccentric to each other supported by each of said rods and cooperating with said cylindrical bearing surfaces, and a spring pressing said bearing members against said bearing surfaces to hold said yoke in collar engaging position.

8. A retainer for collared steels of a rock drill and the like comprising a yoke normally adapted to obstruct the passage of the collar, members extending outwardly from the rock drill and each said member having a pair of cylindrical bearing surfaces eccentric to each other, rods forming part of the yoke and cooperating with said members to permit swinging movementof the yoke out of the path of the collar, bearing members supported by said rods cooperating with said cylindrical bearing surfaces, and a spring pressing said bearing members against said hearing surfaces to hold said yoke in collar engaging position.

4. A retainer for collared steels of a rock drill and the like comprising a yoke normally adapted to obstruct the passage of the collar, members extending outwardly from the rock drill, each such member having a pair of cylindrical bearing surfaces eccentric to each other, rods forming part of the yoke and cooperating with said members to permit swinging movement of the yoke out of the path of the collar, a pair of'bearing members supported by each of said rods and cooperating with said cylindrical bearing surfaces, and a spring pressing said bearing members against said bearing surfaces to hold said yoke in collar engaging position.

5. A retainer for collared steels of a rock drill and the like comprising a yoke normally adapted to obstruct the passage of the collar, members extending outwardly from the rock drill, each such member having a pair of cylindrical bearing surfaces eccentric to each other, rods forming part of the yoke and cooperating with said members to permit swinging movement of the yoke out of the path of the collar, a pair of bearing members eccentric to each other supported by each of said rods, and cooperating with said cylindrical bearing surfaces, and a spring pressing said bearing members against said bearing surfaces to hold said yoke in a collar engaging position.

6. The combination with a rock drill having a collared steel mounted therein, of a yoke normally adapted to obstruct the passage of the collar, a stud extending outwardly from said rock drill and having a pair of cylindrical surfaces disposed eccentrically with respect to each other, a rod on the yoke extending through the stud, means carried by the rod and abutting one of said cylindrical surfaces, and means slidablo on the rod and bearing against the other cylindrical surface for urging said yoke into collar engaging position.

7. The combination with a rock drill having a collared steel mounted therein, of a yoke normally anapted to obstruct the passage of the collar, a pair of lateral studs on said rock drill each having two cylindrical surfaces disposed eccentrically with respect to each other, a pair of rods forming a part of the yoke and extending through the studs, means carried by each rod and abutting one of said cylindrical surfaces, and means slidable on the rod and bearing against the other cylindrical surfaces for urging said yoke into collar engaging position.

8. The combina ion with a rock drill having a collared steel mounted therein, of a yoke normally adapted to obstruct the passage of the collar, a pair of studs extending outwardly from said rock drill and having inner and outer cylindrical surfaces disposed eccentrically with respect to each other, a pair of rods forming a part of the yoke and extending through the studs, means carried by each rod and abutting the outer cylindrical surfaces of the studs, and means slidable on each rod and bearing. against the inner cylindrical surfaces of the studs for urging said yoke into collar engaging position.

In testimony whereof I have signed this specification.

WILLIAM PRELLVVITZ. 

